Loop-spreader and presser-foot mechanism for sewing-machines.



E. ERICKSON.

LOOP SPREADER AND PRESSER FOOT MECHANISM FOR SEWING MACHINES.

APPLICATION FILED IULY 17.1914.

1,161,648, Patented Nov. 23, 1915.

4 $HEETS-SHEET I.

Fig.1

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E. ERICKSON.

LOOP SPREADER AND PRESSER FO0T MECHANISM FOR SEWING MACHJNES.

' APPLICATION FILED 1ULY17l9I4.

L1 1.,Q3. Patented Nov. 23, 1915.

4 SHEETS-SHEET 2.

WWIIIIIIIIIIII/III/IIIIIIIIJk\\ EJERICKSONJ L0 0P SPREADER AND PRESSER FOOT MECHANISM FOR SEW ING MACHINES.

I APPLICATION FILED JULY 1?. I914- Patented Nov. 23, 1%)]5.

4 SHEETS$HEET 3- LOOP SPREADER AND PRESS E. ERICKSON.

ER FOOT MECHANISM FOR SEWING MACHINES.

APPLICATION FILED JULY IT. 19M.-

WIN N N Patented Nov. 23, 19I5.

4 SHEETS-SHEET 4.

is connected to the hub 98 and the other to the hub 97. The latter has an arm 100 provided with a pin 101 which enters aslot in an adjustably fixed arm 102 pivotally connected at 103 to the standard 32 (Fig. The lower end of the arm 102 is formed with an arc slot 104 (Figs. 4.and 5) through which a binding screw 105 passes into the standard. This provides for so adjustably securing the arm 102 as to vary the position of the hub 97 rotatably to slightly loosen or tighten the brake spring 99 as may be'necessary to insure the accurate operation of said spring as a brake.

The hub'98 has an arm 106 (Fig.4) which is connected by a link 107 to one arm 108 of an elbow lever pivoted at 109, the other-arm 110 having a roll which engages a cam groove 111 in the side of the cam disk 92.

he" pivot 109 is a pm which extends throilgh the standard 32 and projects at each end from said standard, being mounted to oscillate in a hole in said standard. At one end this pin109, which is practically a rock shaft, has 'a pinion 112 (Fig. 2) meshing with a: rack 113 carried by a vertically movable rod 114-, which may be connected to a treadle not shown to raise the presser foot when work is to be introduced.

The other end of the rock shaft 109 is provided with a camshaped projection 116 (Fig. 4) which enters an opening in one end of'a pivoted arm 117, said arm being pivotally connected at 118 to the arm 110 of the elbow lever. The arm 117 has a roll 119 which bears against the periphery of the cam disk 92, the latter having a recess or depression 120. As will be readily understood, when the parts occupy the relative positions shown in'Fig. 4, the arm 117 forms practically a rigid portion of the arm 110 of the elbow lever, the rolls carried by these two arms engaging opposite sides of the rib of the cam disk 92 which separates the cam 45.

groove 111 from the periphery of the cam, and therefore as the cam disk rotates the elbow lever is oscillated, the structure and operation of the parts being such that when the operative portion of the cam groove 111 reaches the roll or arm 110 the elbow lever is oscillated to tighten the brake spring 99 (Fig. 6), this occurring during the formation of each stitch.

When necessary the operation of the foot treadle rod 114 acts to oscillate the rockshaft 109 to rotate the cam projection 116 sufliciently to allow relative movement of arms 110, 117 about the pivot 118 so as to release the tension of the spring 99 on the hub 82 and thereby permit the presser foot to be raised when, for instance, it is desired to introduce the Work. This raising of the presser foot is possible regardless of the rotative position of the cam disk 92 by the continued upward movement of the memher 114 coming into contact with a presser foot lifting device to be hereinafter described.

As best shown in Fig. 4, the inner wall of the cam groove 111 is provided with a recess 121 which, when it arrives opposite the roll of the arm 110, will permit said roll to move toward the axis of rotation of the cam disk 92 soas to relieve outward pressure on said roll and thus release the braking effect of the brake spring 99 and permit the presser foot to be lifted. The machine is provided with a take-up arm 125 and a thread lock 134, but as these mechanisms form no part of the present invention they are not herein shown and described.

The needle 151 has its carrier 152 (Fig. 1') pivotallymounted onthe fixed pin 153. The carrier 152 has a rearwardly projecting arm 154 connected by a link 155 with an arm 156 which is fixedly but adjustably secured to one end of a rock shaft 157 (Fig. 1) from which movement is imparted to said needle to cause it to enter the work after being pierced by the awl 174.

A looper 201 is provided but is not herein described as it forms no part of the present invention.

The loop spreader comprises a hookshaped member 216 (Fig. 2) formed at the end of the curved portion 217 (Figs. 1, 2, and 3) of a rock shaft 218 mounted in a bearing 219 supported by a suitable bracket 220. The rear end of the rock shaft 218 has an arm 221 connected by a link with the outer end of an arm 223 (Figs. 2 and 4) which is pivotally supported on the sleeve 81 hereinbefore described. At the point where the link 222 and arm 223 are connected, a roll 224 is mounted, said rol entering the cam grooveLllll 'in the disk 92. The object of the swinging arm 223 is to keep the roll 224 in proper position to be acted upon by the cam groove 111. Said cam groove 111, as will now be understood, serves to actuate not only the loop spreader but also the presser foot lock hereinbefore described.

In order that the presser foot maybe lifted whenever desired by the operator, I provide such a structure as illustrated in Fig. 5, the arm of the presser foot having a rearwardly extending lug or projection 227 in position to be engaged by one end of a lever 228 pivoted at 229 to any suitable part of the machine, the other or rear end of the lever 228 extending over the upper end of the rod 114 which, as hereinbefore explained, may be operated by a treadle not shown. -Normally the space between the upper end of the rod 114 and the rear end of the lever 228 is such that it is only during the last portion ofithe upward movement of the rod 114 that the lever 228 is actuated to raise the presser foot. This makes a very simple and effective mechanism for operatno :"ia efreae ing the presser foot and the loop spreader from the same cam and causing the latter to be controlled by'the movement of the,

presser foot.

The Operation and many advantages of this invention it is believed will be fully understood from the foregoing description.

Having thus described my invention, I claim: I

'1. In a sewing machine, the combination v With the stitch forming mechanism thereof, of a presser foot having means including a cam for holding it in locked position, and a loop spreader having means whereby it is actuated by the same cam surface that actuates the presser foot lock. 1

2. In a sewing machine, the combination with the stitch forming mechanism thereof, ofa rock shaft having a loop spreader at one end, a presser foot having means for holdsleeve, an arm on the rear end of said rock shaft, and a link connecting the free ends of said arms.

at. In a, sewing machine, the combination with a stitch forming mechanism thereof, a pivoted presser foot, means for holding said presser foot in locked position including a cam, a loop spreader, an arm movable about the axis of said presser foot pivot and having a member at its outer end engaging said presser foot locking cam, and means connected to the outer end of said arm for actuating said loop spreader.

5. In a sewing machine, the combination with a stitch forming mechanism thereof, a rock shaft, a loop' spreader at one end thereof, a presser foot, means for holding said presser foot in locked position including a cam, a crank on said rock shaft, a link pivotally connected at one end to said crank and having a projection at the other end, adapted to engage said cam, and means connected to said link for limiting itsmovelnent about its pivotal connection with said crank.

Signed by me at Boston, Mass, this 18th day of June, 1914.

EDWARD ERICKSON. Witnesses:

EDWARD F. ALLEN, WALTER E. LoMBARD. 

